Self-priming pumping apparatus



June 4, 1929. w. F. BRANDT SELF PRIMING PUMPING APPARATUS Filed Jan. '7, 1928 5 Sheets-Sheet June 4, 1929. 1,716,105

w. F. BRANDT SELF PRIMING PUMPING APPARATUS Filed Jan. '7, 1928 5 Sheets-Sheet 2 54 V J: y a l g a 2 Q 3/ E I 1 26 9 l 27 I /7 I I I INVENTOR ATTORN EY June 4, 1929. w, BRANDT 1,716,105

SELF PRIMING PUMPING APPARATUS Filed Jan. 7, 19 28 s Sheets-Sheet 5 F 4 l l g5 ll INVENTOR BY/VIIZZM FEM I Wm ww- ATTORNEY Patented June 4,1929.

UNITED TBS WILLIAM F. BRANDT, OF FORT WAYNE, INDIANA, ASSIGNOR, BY MESNE ASSIGN- MENTS, TO THE WAYNE HOME EQUIPMENT COMPANY, OF FORTWAYNE, INDIANA,

A CORPORATION OF MARYLAND.

SELF-IPBIMING- PUMPING APPARATUS.

' 7 Application fi led January 7, 192s.- Serial No. 245,122.

My invention relates to submerged selfpriming pumps such as are used on oil burners for domestic and similar purposes.

It has been found diflicult to constructia 5 pumping apparatus for such use that will not lose its prime; and oil burners must be automatic in their operation and reliable at all times for theloss of prime in an oil burner apparatus leaves the home'without heat. If

the oil supply fails in extremely cold weather with no one present to service the apparatus, water and steam pipes will freeze and burst and causegreat damage.

Efficient pumpin' apparatus for oil burners has pumps; one a suction pump to draw in oil from the storage tank to the sump, another to force oil from the sump to the burner and domestic the other to return oil from the sump to the storage tank whenever the accumulation of oil in the sump reaches 7 a predetermined level.- This invention embodying a pumping apparatus with one pump is as 'eficient for all three functions as t e three pumps. 1

The principal object of my invention is to provide an eflicient and reliable self-priming pumping apparatus. Another object of my invention is to construct such a pump of simple, strong and I economical design; and hence relatively low in cost and requiring a greatly reduced amount of service.

In the particular embodiment of my invention selected for illustration Figure 1 is a top plan view of the reservoir or sump of an oil burner with the fuel oil pump installed therein s'hown'in dotted lines' Fig. 2 is a vertical sectionon the line 2-2 of Fig. 1;

Fig. 3 is a horizontal section on the line I 33 of Fig. 2 as though there shown in full;

' Fig. 4, an enlarged view, is a vertical section on the line 44 of Fig. 1;

Fig. 5, an enlarged view, is a vertical section on the line 55 ofFig. 1

Fig. 6, an enlarged view, is a cross section on the line 6 -6 of Fig. 2 as though there shown in full;

Fig. 7 a detail, is an enlarged view, of the piston valve only, and

Fig. 8, a detail is a cross section on the line H of Fig. i.

een made, with three apparatus with I casting 1, and any suitable stufing box 19,

Referring now to the drawings, 1 is. a

casing within which is a reservoir 2, the botby the legs 5 which rest onthe floor. ,Within the casting 1 is also another chamber 6,

into which the fuel oil flows from the inlet pipe 7, entering a cupped screen container 8 with stiffening ribs 9. A cover plate 36 is used to close the chamber 6 and is held. in place by cap screws 37.

After the oil has passed through the strainer 8 it flows out of the chamber 6 through outlet 10 and passageway. 11, 11 in casting 15 to chamber 12 in a plate 13. Plate 13 is secured between a lower plate 14 and the bottom plane surface of member 15 by cap screws 16. Members 13, 14 and15 are secured to the castin 1 by cap screws 32. The plate 14 has a relie chamber 28.

A pump shaft 17 provided with spiral oil groove 18, is secured to the motor (not shown), and extends through'the top of the provided with drain-back passage 20. Shaft 17 has a slot 21 adaptedto receive a tongue 22 of another section 17 of said shaft, which section also has an oil groove 18*. 4

To the lower end of shaft section 17 is fixed a gear 23 which, upon rotation of the pump shaft-in the direction indicated by the arrow in Fig. 2, co-acts with the idler gear 24 on the stud 25 to pump the'fuel oil fed to chamber 12 through the passage 11*, from said chamber through passage 26*, 26 and 31 to I dischar e pipe 27, that leads to the burner (not s own). The fuel oil when under suficient ressure in discharge pipe 27 forces piston va ve 32 0E its seat 33' against the at pressure of spring 38 allowing all excess fuel oil to return to reservoir 2,through" passage 34. This effectively prevents buildmg up such a? pressure at the burner no'zzle as might cause dripping when the burner is tem orarily shut down.- 4

T e piston valve 32 may be'uof any convenient --constructi'on, a suitable form being shown in Figs. 7 and 8. q

The valve 32 has'a by-pass bleed- 39 and the stem consists of guiding portions 40 with one or moreflattened sides 41 and 42 and a recessed cylindrical portion 43t'o permit oil any.

to flow freely from passage 31 on its way to pipe 27, It will be noted that the passages provided by the flattened sides 41 are of greater cross-sectional area than those formed by flattened sides 42, so thatwhenever substantial pressure is built up on the burner nozzle and pump side of the valve 32 the valve will be forced off its seat 33 allowing all excess oil to flow freely to passage 34. The by-pass bleed 39 prevents valve 32 from chattering on its seat 33, by allowing air and a small quantity of oil to passthrough the bleed 39 when the burner starts operating again after being temporarily shut down.

A pipe is provided in the casting 1 near its top to convey all excess fuel oil in the sump 2 to the source of supply (not shown).

There is a boss 29 on the lower side of plate 14 terminating near the floor of the chamber 2, with a priming port 30 connecting the chamber 2 with the chamber 12 in the plate 13. Through this port the fuel oil is drawn whenever necessary as long as there is an oil in chamber 2, so that the pump is selfprimlng.

When the apparatus is first put in use, the chamber 2 is filled with oil through opening 44 which is then closed with a plug (not shown). If the chamber 2 becomes completely empty, the pumpwould not be selfpriming. In oil burner operation, this would not happen, as the size of the chamber 2 would be proportioned to the capacity of the burner, so that, if the entire suction line was empty, the burner would continue to burn from the oil in the sump until the air in the suction line was disposed of, so that the sump would refill automatically through the supply line.

Although a preferred form of the invention'has been shown and described, it willbe understood that a mechanic working within the scope of what is claimed, may make changes without departing from the spirit of the invention.

I claim as my invention and desire to secure by Letters Patent of the United States 1. In a pumping apparatus a casing forming a sump with inlet and outlet and openings through an upper part of said casing, a pump housing in said sump terminating near the bottom thereof, a pump in said housing, a priming port connecting the suction side of said pump with said sump near its bottom, a conduit through said housing to convey liquid admitted through said inlet opening to the suction side of:said pump and a conduit through said housing to convey liquid from the discharge side of said pump to said outlet opening.

2. In a pumping apparatus a casing forming a sump and having an inlet opening from the source of liquid supply, an outlet to service and another outlet through which ply, a housing encasin r a pump normally submerged in the liqui. in said sump and a port through said pumphousing connecting saidsump below the normal liquid level with the suction side of said pump.

3. In a pumping apparatus acasing forming a sump and having an inlet opening near the top thereof from the source of liquid thereof, an enclosed gear pump 111 said sump,

means for operating said pump, a priming port connecting said pump and sump, an inlet conduit from said inlet opening to said pump, an outlet conduit from said pump to said outlet opening, a relief conduit connecting said outlet conduit with said sump, a spring closed valve in said relief conduit opening toward said sump, and an overflow outlet through said casing at an upper part thereof.

5, A pumping apparatus comprising in combination a casing whose lower portion constitutes a sump, a filtering reservoir near the top of said casing, an opening through said casing to admit liquid from the source of supply to said filtering reservoir, a filter strainer in said reservoir, a pump housing in said sump,/a pump in said'housing, a priming port connecting the suction side of said pump with a lower part of said sump, a conduit to convey liquid from said filtering reserizoi'r' to-the inlet side of said pump, an outlet opening in an upper part of said casing to convey liquid from said casing to service, a conduit to convey liquid from the discharge side of said pump to said outlet opening, a relief conduit connecting said discharge conduit near the outlet opening with said sump, a check valve in said relief conduit and an overflow from an upper portion ofsaid sump to convey liquid back to the source of supply.

6. In a pumping apparatus a casing having a sump, an inlet opening in said casing to admit liquid to said casing above said sump, an outlet opening in said casing above said sump to convey liquid from said casing to service, a pump housing in said sump, a pump in said housing, means for operating said pump, a priming port connecting the inlet side of said pump with "excess liquid flows back to the source of sup- 1 1 miaioa said sump, a conduit in the casing and house ing for conveying liquid from said inlet opening to the suction side of said pump, a conduit inthe casing and housing for conveying liquid from the discharge side of said pump to said outlet opening, a relief conduit connecting the said second conduit with said sump, a valve in said last named conduit opening toward said sump, means for holding said valve closed under normal pressure conditions at said outlet opening and a second outlet in said casing through which liquid may flow to the source qt suppl r i. In a pumping apparatus a casing having a sump, an inlet opening in said casing to admit liquid to said casing above said sump, an outlet opening in said casing above said sump to convey liquid from said casing to service, a pump housing in said sump, a gearpump in said housing, means for operating said pump, a priming port connecting the suction side of said pump with said sump, a conduit in the casing and housing for conveying liquid from said inlet opening to said housing on the suction side-0f ,said pump, a conduit-in the casing and housing for conveying liquid from the discharge side of said pump to said outlet opening, a reli'efvconduit connecting the sec- 0nd conduit with said sump, a valve in said last named conduit opening toward said sump, means for holding said valve closed under normal pressure conditions at said outlet opening a bleed through said valve, and a second outlet in said casing through wlhich liquid may flow to the source of supp y.

8. In a pumping apparatus a casing forming a sump, means for normally maintaining a supply of the liquid to be pumped in the sump, an encased pump normally submerged in the liquid inthe sump, a conduit direct from the source of liquid supply to the suction side of the pump, a conduit from the discharge side of the pump to service and a conduit from the sump to the suction side of the pump.

9. In a pumping apparatus a casing with inlet and outlet openings and forming a sump, a pump, a housing encasing said pump and normally submerged'in the-liquid in said sump, a conduit connecting said inlet opening with the suction side of said pump, a conduit connecting said outlet opening with the 'discharge side of said pump, and a port through said housing con necting said sump 'with'the suction side of said pump.

10., In a pumping apparatus a casing with inlet and outlet openings and forming a sump, a pump, a'housing suspended from said casing encasing said pump and normally submerged in the liquid in said sump, a conduit connecting said inlet opening with the suction side of said pump, a conduit the suction side of said pump, a conduitconnecting said outlet opening with the discharge side of said pump and a port through the bottom part of said housing connecting said sump with the suctionside of said pump.

In testimony whereof I have hereunto set my hand.

". WILLIAM BRANDT. 

